FORAMINIFERA OF THE ATLANTIC OCEAN. 175 



Siphogenerinn raphanus — material examined. 



SIPHOGENERINA DIMORPHA (Parker and Jones). 



Plate 42, figs. 16-18. 



Uvigerina (Sagrina) dimorpha Parker and Jones, Philos. Trans., vol. 

 155, 1865, p. 420, pi. 18, fig. IS. 



Sagrina dimorpha H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 582, pi. 76, figs. 1-3; Journ. Roy. Micr. Soc, 1887, p. 915.— H. B. 

 Brady, Parker, and Jones, Trans. Zool. Soc. London, vol. 12, 1888, 

 p. 225, pi. 45, fig. 6,— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, 

 No. 9, 1894, p. 52, pi. 9, figs. 510, 511.— Bagg, Bull. U. S. Nat. Mus., 

 vol. 34, 1908, p. 152. — Heron-Allen and Eaeland, Trans. Linn. Soc. 

 London, ser. 2, vol. 11, 1916, p. 266. — Sidebottom, Journ. Roy. Micr. 

 Soc, 1918, p. 148. 



Siphogenerina dimorpha Egger, Abh. kon. bay. Akad. Wiss. Miinchen, CI. II, 

 vol. 18, 1893, p. 317, pi. 9, fig. 30.— Cushman, Bull. 71, U. S. Nat. Mus., 

 pt. 3, 1913, p. 106, pi. 45, figs. 3, 4; Bull. 100, U. S. Nat. Mus., vol. 4, 

 1921, p. 279, pi. 56, fig. 8. 



Description. — Test either somewhat compressed or nearly cylindri- 

 cal, very slightly tapering from the somewhat rounded initial end to 

 the greatest width near the apertural end; chambers comparatively 

 few, rather broader than high, slightly inflated; sutures distinct, 

 the basal portion of the last few chambers somewhat excavated and 

 tending to bridge the sutures between the excavations at regular in- 

 tervals; wall with a coarsely pitted surface; aperture circular, ter- 

 minal, at the end of a short neck, usually with a distinctly phialine lip. 



Length of Atlantic specimens not over 0.60 mm. 



Distribution. — This is a widely distributed species, although, as 

 will be noted later, there may be more than one variety. The origi- 

 nal stations given by Parker and Jones are Red Sea (near the Isle 

 of Shadwan) at 372 fathoms (681 meters) ; Abrohlos Bank, 260 

 fathoms (476 meters) ; Australian Coral-reefs, 17 fathoms (31 

 meters). Brady gives the following notes as to its distribution, in 

 the Challenger report : 



The geographical area inhabited by Sagrina dimorpha is wider than that 

 of any other species of the same genus. It extends as far north as Bukken 

 and Oster Fiords, near Bergen, Norway (Norman) ; and a single specimen 

 from the Scottish coast is reported by Mr. Robertson. It has been further 

 noticed in the North Atlantic, off Gomera, Canaries, 620 fathoms (1,134 

 meters) ; and off Culebra Island, West Indies, 390 fathoms (713 metei'^) ; 

 in the South Atlantic, off Ascension, 420 fathoms (768 meters) ; and on the 



